K. Mandal et al 2006 Europhys. Lett. 75 618 doi:10.1209/epl/i2006-10148-y
K. Mandal, Subarna Mitra and P. Anil Kumar
Show affiliationsThe temperature dependence of saturation magnetization of ferrite nanoparticles has been studied to investigate the applicability of Bloch spin-wave theory to the finite-size systems. T3/2 law is valid above 75 K for the smallest ferrite particles obtained in this experiment having size of 2.5 nm. The region of validity of Bloch law increases at the lower-temperature end with the increase in particle size and interparticle interactions. The anomaly from the spin-wave theory has been observed with an upturn at low temperature, which can be explained by considering the quantization of spin-wave spectrum due to the finite size of the particles.
Issue 4 (August 2006)
Received 17 February 2006, accepted for publication 27 June 2006, in final form 27 June 2006
Published 12 July 2006
K. Mandal et al 2006 Europhys. Lett. 75 618
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